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Effects of Nitrapyrin on Nitrate Movement in Soil Columns¹

ABSTRACT

The purpose of the study was to consider the possible benefits of a nitrification inhibitor to control nitrate leaching in soils. Sandy loam soil cores were taken in 1-m-long polyvinyl chloride cylinders. After prewetting the cores, nitrapyrin (a nitrification inhibitor)-treated urea was incorporated into the top 10 cm of three cores, and untreated urea was incorporated into the top 10 cm of three cores. The columns were leached periodically with distilled water. After 91 days, 1 and 9.7% of the applied N had leached from the nitrapyrin-treated and untreated cores, respectively; after 144 days, 41.9 and 53.0%, respectively, of applied N had been leached. Short-term studies indicated that further work using a nitrification inhibitor to reduce nonpoint source nitrate additions to ground water is justified.

Key Words: nitrification • urea • ground water • nonpoint source pollution

¹ Contribution from the USDA-SEA-AR, North Appalachian Exp. Watershed, Coshocton, OH 43812 in cooperation with the Ohio Agric. Res. and Dev. Ctr., Wooster, OH 44691.

² Soil Scientist, USDA-SEA-AR, North Appalachian Experimental Watershed, Coshocton, Ohio.

Received for publication August 20, 1980.